Submarine sound-direction finder.



Nu. roams ARTHURJ. MUNDY, onaosrop; AssAcHus-nrrs, se en TOS BMA nunsSIGNAL, COMPANY, or WATERVILLE, Mama-a conronar on ,j)

- OF i iAlN E.

Iatented August as, 190 1 I SUBMARINE SOUND-DtREdTION' FINDER;

sramztca'norr forming part a! Le tten Patent No. 768,578, dated Augustbe, 19 4. A man on Ag'wil as, 1902. am! 1a. 164.80, ma ia) To all whomit may concern:

; Be it known that LAR'I'HUR J .Mtmn'r, a citizen of the United States,and a resident of Boston, in the county of Suii'olk and State ofMassachusetts. have invented a new and iisefnl Improvement in SubmarineSound-Direction Finders, of which the following is a full, clear, andexact description, reference being bad to the accompanying drawings,forming a part 1 of this specification, in explaining its nature; Thepurpose of this invention is to provide an apparatus adapted to besubmerged in water and to there by its movement in the water and becauseof'its properties ascertain thedirection of approach ofthesound-signaling vibrations or impulses which the water receives 'from asound-signaling station and transmits toward it. 4

It is desirable in submarine telephony not 2 only to provide for thereception of sound signals or vibrationsimparted to water, butv also atthe same time to ascertain as nearly as possible the direction fromwhich the im' pulses or vibrations come. This is of special consequencewhen the sound impulses or vibrations are used forindicatingdanger-points. My invention comprises a small'compact'apparatus, which includes upon one side a zone or section sensitive tosou nd-vibrations and in 3 operative conjunction with an electricsoundtransmitter and which upon the other side is nonreceptive to suchvibrations or substantially dead to them.

The apparatus is mounted, preferably, in a manner which permits it to beturned in the water to present all its sides in all horizontaldirections. It is also connected electi'ically with a receiver abovewater and by means of which the sound-vibrations which it 4 receives aretransmitted to the bearer. The user determines the direction in whichthe sound-vibrations are traveling by the variations in the intensity ofthe sound-signalstransmitted to -him through the receiver. These may beeither the loudest or the faintest so received, or both may be employedin estimating the direction.

U ITED] STATES -I will now describe. the invention in conthisspecification, whereinjunction with the drawings forming-a'partof D p ScFigure -1 represents the apparatus as sub-- inerged.- N Fig. 2- sliows aportion of it in en; larged vertical section. a Referring to thedrawings, A represents a shell, referablyof brass. Itis-madein advsuitab e manner, and 1n the drawings it is shown in the three partsaa'p', the part a be-.

ing a central one to 'which the parts a a are attached, preferably byscrewing. I- prefer that they be in the form-of asliell. I also preferthat it be mounted upon a rod or support a, by means of which it may beturned in the i water on a vertical axis, and also that the rod containthe electric conductor a, which conneets the transmitter contained inthe shell in'duplex form, if desired.

withthe receiver 4''. The receiver may be The electric transmitter B- islocated at or near the'center of the shell. sound-receiving diaphragm7), held by its edge against the shell 6' of the central'section abyineans of a screw-ring bf This diaphragm supports a means for varyingelectrical resistonce 6" and the electrodes 6 tfThey are .5

mounted upon the diaphragm and are actuated byits vibrations. The faceof the diaphragm forms the inner end of achamber Bf, the outerIt'compr-ises a boundary of which is formed by the 'shell of issubmerged upon the diaphragm; This pro- I 'vides the sensitive sectionof the drectionfinder.

'The portion-of the apparatus back of the transmitter is bounded by thepart a of the shell, and it is separated from the chamber C thereofby-a' partition 0, of rubber'or other part a., The chamber 0 thus formedis filled with any sound absorbing or deadening mate- 9 sound-deadeningmaterial, the edgeof which is clamped between the part a and the centralvibrations from the surrounding vvater the transmitter. I

inen the apparatus is turned so thatithe transmitter is at right anglesto the line of ad.-

vence of the sound-vibration waves, then itis most sensitive .to thernand responds with greater amplitude or-poiver, and sound deliveredthrough the receiver is at it; loudest; When the apparat'usjs turned topresent its dead side tothe soun wave, the s0und-vibrations received bythe smallest force or efiect and the vibrations delivered by it to thereceiver produce the faintest sounds which the apparatus transmits.Between these two extremes the sound varies in force or strengthaccording as it is turned to reach one or the other of the tv'voextremes. The apparatus maybe used in any desired vi'rny either outsideof a ship or vessel or in a water-tank or receptacle within it. Wherethere is a possibility of the sound being reflected by the side of thevessel, it will. be desirable when the direction-finder is so used-thatis, outside the vessel-to sinl'r it beneath the, keel in order that thereflection of sound may be avoided.

Having thusfully described my invention,

1 claim and desire to secure by Letters Pat ent of theUnited- States 1.'Asubmarine sonnddirection finder com-- prising a submerged apparatushaving a side sensitive to the reception and transfer ofsound-vibrations from the water and also containing an e! ectric transmitteradapted to receive such vibrations and electrically connected with asound-receiver, and also havinga fiestas transmitter have their betweenthe transmitter a sound-dcadener 'receptionrmd transferof'sound-vibrations 2. A submarine sound-direction finder co prisingasnbnie rgcd apparatus having an el tric transmitter electricallyconnected wit} sound-receiver and also having upon one si of thetransmitter asound receiving and trai ferring medi'nil' and upon theother side the transmitter a'sound-deadening mediu: and means forturning said apparatnsl 3. Asubmarine-seunddirection finder co:prising-an electric transmitter-electrical ly cc nected with a receiver,a sound-foeuser an;

sou nd-deadehenthesound-fobriser being up .one side of the transmitterand the some dadener upon, the other side ofit.

4. A submarine sound-direction finder COI prising an apparatus having anelectric tra! initier electrically connected with a receiw asound-focuser, as'oundconducting medir and the focnser,- 11:

upon the opposite side the transmitter.

5. 'Asulima-rine sounddirection finder col prising: a spherical casesuspended upon tf end 01' a turning rod or device, one section whichcomprises an electric transmitter eir tricalLv connected through. therod with sound-receiver and adapted to transmit son-n vibrations,received by the case, and Inca between the transmitter and a part ofthe on for deadening the direct transmission of soun vibrations thereto,whereby the 'transmitt is more sensitive to vibrations received fro onepart of the case than from the other, ARTHUR J. MUNDY'! Witnessesr-

